Mechanical movement.



c. J. ROBERTSON. MECHANICAL MOVEMENT. APPLICATION FILED MAR. 21, 1905.RENEWED JUNE 4, 1909.

4 sums-sum 1.

im 71505: 6, R) be a; 6-5 (1/1 Patented Jan. 4, 1910. i

'TLTLL/TC eases Vim-1 C. J. ROBERTSON. MECHANICAL MOVEMENT.

APPLICATION IILED MAR. 21, 1905. RENEWED JUNE 4. 1909.

-. AKU 0 05 mu lm w. i 1 a "GE 3 mm e4 m w m M Mm W 6/v wv I AwfifCLT'less s G. J. ROBERTSON, MECHANICAL MOVEMENT. APPLICATION FILEDMAR. 21, 1906. RENEWED JUNE 4, 1909;

mW i w Patented Jan. 4, 1910.

4 sums-sum s.

.YFtrZOfi: 6' 7.25 0061, Z sum h: lz/amre a fi g @014 G. J. ROBERTSON.MECHANICAL MOVEMENT. APPLICATION FILED MAR. 21, 1905. nnmzwnn mm: 4,1009.

O-L mm Q mm Y Z um m w 4 t.

. \N 4...... fi hnu /l 1 m eas es UNITED STATES PATENT OFFICE.

CHARLES J. ROBERTSON, OF TAUNTON, MASSACHUSETTS, ASSIGNOR TO THECAMPBELL PRINTING PRESS & MANUFACTURING COMPANY, OF NEW YORK, N. Y., ACORPORA-.

'IION OF NEW YORK.

MECHANICAL MOVEMENT.

Application filed March 21, 1905, Serial No.

To all whom it may concern: I

Be it known that 1, Cimnnns J. ROBERT- sox, a subject of the King ofEngland, re-- to cation for patent filed October 6, 1904, Se-

rial No. 227,344, I have found that the chanism is capableof certainmodificaand improvements which are of advane' first importantpointwherein I have dified and improved the apparatus, const in.arranging: the mechanism so that 3 a'ch reverse will, -,take more than180 degrees or a halfaturn. By this modification, as. still easierreverse can be obtained which is of advantage on large size machies. If

{a 'p i-tman befemployed, this increase in the V reversing movement canbe obtained advan- .;i "tageously by employing what is sometimes spokenof by engineers as the sweet side of the pitman.

' known in mechanics that if a k-pin be connected by a pitz ontalsliding member that mparted to that member will each direction fromcentral position, wnch difference arises from the angular deflection of[the pitman or the p1t- :g-man error as it is sometimes called.

Referring to Figure 14 for illustration, 1' esignates a radius, oncrank-pin, p a pitman and s a sliding member. Suppose the crank orwrist-pin to move from position #1 to position #2, where the pit-man andcrank-arm are at suchfan angle, less than the angular deflection of thepitman imparted to the slider will change to a minus acceleration orretardation. During this movement of the crank-pin, the movement of thesliding member is an accelerating movement both from. th wrist-pin andfrom the deflection of the pitman. From this pointon in the revolution,the movement imparted by the deflection of the p tman 1s '1: a retardingmovement first acting. in oppo- 'in certain kinds of printing presses.

-90 degrees, that the plus acceleration from sition to the acceleratingmovement imparted by the wrist-pin during angle a, that is while thecrank-pin moves from position #2 to position #3, and then a retardingmovement acting in conjunction with the retarding movement imparted bthe movement of the crank-pin while the l atter movesfrom position #3to'position #4. The result'of this action is that the movement impartedto the sliding member from position #2'to position #4. is a-move'mentwhich first approximates, or is almosta constant speed movement Whilethe wrist-pin moves from position 2 to position #3, and then is agradual ecreasing or retarding movement to rest from. position #3 toposition #4. Byusing this principle in a reversing mechanism andcommencing the reversing action substantially at position #2, a mucheasier translation from the constant speed drive to the reversing actionis accomplished; and a longer reverse is obtained, bot-h angularly andin direct travel. Therefore, an easier reverse can be obtained from awrist-pin.

The particular object of this invention is to modify the mechanism ofsaid previous 'application'to utilize this sweet side of the pitmanreverse. In developing the same, certain modifications and changes inthe mechanism have been made, the principal one ofwhich is the use of areversing pinion orpinions separate from the main driving mechanism.

The apparatus is illustrated in the accompanying four sheets ofdrawings, referring to which,

Fig. 1- is a side elevation of the mechanism. Fig. 2 is'a detail view ofone of the parts used in the reversing mechanism. Fig. 3 is a detailview of the cam mechanism used to actuate the impression cylinder. Fig.4 is a cross sectional view of the mechanism. Fig.

-5 is a detail view of the mechanism employed to raise and lower the mamshaft. is a detail vlew of the connecting gearing Fig. 6

Specification of Letters Patent. Patented J an, 4, 1910'.

251,205. Renewed June 4,1909. Serial No. 500,120. I i i .tained from theinternal gear 17.

Referring to the drawings'and in detain, A. designates the usualframework mounted to reciprocate on which is the usual bed or formcarrier 13.

G designates the impression cylinder, the shaft of which is journaledeccentrically in bushings 10 fitted in the frame. I

Mounted on the end of the impression cylinder shaft is a gear 11, whichmeshes with a driving gear 12to which power is applied in any suitableway. The driving gear is hereinafter referred to fitted in strut '16.

This "driving shaft 18 carries a driving pinion 19, which meshes with arack 20 secured to the .bed. A pinion 21 is arranged on the end of saiddriving shaft 18 in positionto engage the partial internal gear 1'7.Arranged on the'main shaft 14 is a partial external or spur gear 22andthe driving shaft 18 carries a pinion 23 in position to engage thepartial spur gear 22. f The said partial external and internal gearsoccupy substantially similar angular positions on the main shaft 14. 'Y

The mechanism hereinbefore described constitutes themaindrivingmechanism for imparting the constant speed movements andoperates asfollows: When the main shaft- 14 is lowered by its eccentric bushings15, the

partial internal gear 17 will engage the pin-v ion 21 on the drivingshaft 18 and 'will turn the driving pinion 19 to move the bed throughthe rack 20. Vhen the main shaft 14 is raised by its eccentric bushings15, the partial external gear 22 Will engage the pinion 23 and hencewill turn the driving pinion 19 to actuate the bed through the rack 20in a reverse direction from the movement ob- This mechanism is sodesigned that these movements will take place at the same speed. and forthe same distance. Except for the angular section of the partialinternal gear 17 and the partial external gear 22, this mechanism is insubstance the main driving mechanism shown, described and claimed in myapplication for patent Serial No. 22734 1, previously referred to- Onthe face or inside vof the internal gear 17 is arranged a wrist-pin 25,or crank element which actuates the reversing mechanism as hereinafterdescribed. The relation between the internal gear 17, the pinion 21,theexternal gear 22, and pinion 23 is such that the uniform speedimparted to the bed forward and backward is the same as the speed of vthe bed as given to it by crank-pin 25, connecting rod 26, rack-rod 29,pinion 24 and rack 20 at the instant of greatest.deflection. The maindriving nwchanism will impart a constant speed forward and backwardmotion to the bed for less than a half turn of the main shaft 11. as thepartial go s 17 and 22 are made less than 180 degree. inoperativecircumference.

The reversing mechanism will now be described.

i s l The left hand connecting p1ece, looking at,- 1

Fig. 1: will be first described see Figs. 2',-

6 and 7 This connecting piece is slotted at its forward end and thesides of the slot are accurately finished. Fitted into the slot is ablock 30 which forms a supporting and guiding means for the inner end ofthis connecting. piece. in the strut 16 and the driving shaft 18 isjournaled in said bushing, as previously stated. This bushing 31 has ahub 32 whichis eccentrical-ly arranged and which carries said block 30.Formed or secured to the connecting piece 29 are upper and lower racks33 and 34 which are arranged in position toen'gage the upper and lowersides of a gear 24 secured on the driving shaft 18. This gear is madewide faced and is arranged to engage short racks 210 and 241 A bushing31 is journaled.

attached to the bed, as shown to best advantage in Figs. 1, 4 and 6 ofthe drawings. The right hand connecting piece 29 is similarly connectedexcept that the parts which connect the same are arranged 011 a shaft180 which is journaled in the frame-work in line with the driving shaft18. The rack 242 which the reversing gear 24 of this arrangementengages, is made of a single piece and of a length so that theright-hand: gear- 21 will remain constantly in mesh therewith.

This right-hand connectingpiece 29 acts as v a squaring mechanism, or isa complement of the left-hand reversing mechanism aiding in taking theheavy strain of reverse. The same will be neglected for furtherdlscussion until hereinafter referred to as thedetails of its operation,except as hereinafter indicated, are identical with the left-handconnecting piece 29. The racks 33 and of the connecting piece arearranged alittle farther apart than the diameter of the reversing pinion24. When the bushing 31 is held in position as shown in Fig. 6, theeccentric hub 32'wi11 be at its highestposition and the block 30 .willthus guide the connecting piece 29 so that the lower rack '34: willengage the reversing pinion 24. When thebushing 31 is turned,'which isdone by the 3, mechanism hereinafter described, the guidwingblock 30will be held at its lowest posia tiontso that the upper rack 33 willengage the parts will now be described.

reversing pinion 24.

The cam mechanism for operating these A cam shaft. 37 is j ournaled inthe machine and is'dri'ven by any suitable gearing so as to turn twicefor each two-revolutions of the"m"ain shaft'14 or twice for ea'ch cycleofi'operatiom Arranged on said cam shaft is a cam 38, engaging which isa roller '39 arranged on a lever 40 secured on a shaft 41 journaled inthe machine. This lever 40 is provided with teeth 42 at its upper endwhich engage teeth projecting from the bushing which is journaled in theflame. (9n the inner end of'the shaft 41 is arranged a similar mechanismas shown in detail in my prior application. Bythis mechanism,

.sliaft 49 journ aled in the frame-work. On' the outer ends of thiscross-shaft are-arran ed levers 50 which connect by links 51 to t eeccentric bushings 10 which carry the impression cylinder. By thismechanism,

the impression cylinder will be raised and of which are rollers mounte'lo'were in unison with the shaft 14, the advantages of which operationare pointed out and claimed in my prior application for patent" referredto. Also arranged on said cam-shaft are cams 52, engaging the grooves onthe ends of pivoted rocking levers 53 which have teeth 54 which enga eteeth 55 formed on the bushings 31. T ese cams 52 are of substantiallythe same contour as the cams previously described and they operate toraise and lower the "guide blocks 30 for the connecting pieces 29. I

The operationcan be followed by the diagrams. In Fig. 8 the bed is shownas just completing its uniform forward speed movement obtained from theinternal gear 17. The reversing pinion 24 is just engaging into thereversing rack 240. It wil be noted that this engagement takes placebefore the crank-pin 25 has reached its high: est position by theangular difference a hereinbefore ointed out. Now, as the wristpin'traves from this position to-its dead center at the left, shown in Fig. 9,the speed of the bed will be retarded and the bed brought to a state ofrestat its left hand extreme by the. action of the pitman and its aconnecting piece previously referred to actuthe amount of the angle a,and hence the tlme and movement of this'retardation will be greater thanthat obtained with the usual true or half-turn c1 ank reverse. thewrist-pin/moves from its left-hand dead center, shown in Fig. 9, to theposition shown in Fig. -10, the bed will be started on its movement tothe right at a speed gradu ally commenced at zero and increasing up tofull speed. Thus from passing from position shown in Fig. 8 to p sitionshown in Fig. 10 the reversal of the bed at its lefthand or forwardposition is obtained. This reversing movement is greater angularly thanthat usually obtained from a. teue, crank reverse by twice the angle aand theitrafvel is correspondingly greater'than theftnsual radius ofreverse. The external gear22now comes into operation and gives the bedits return movement. Durin this return movement, the bushing 31 will beoscillated so that the lower racks 34 will next engage the reversingplnions 24. The same reversal tial spur gear 22 are made less than halfgears angularly by twicethe angle a. By this arrangement the time andtravel of the reversing movements are increased relatively to theconstant speed movement, and. hence an easier action is obtained.

The mechanism as shown is applied to a two-revolution movement in-snchway that each reverse takes more than a half turn and eachconstant speedmovement takes correspondingly less than a half turn. When the constantspeed movements are taking place, the connecting pieces 29 run out ofengagement with the reversing gears 24; the right end 'reversing gearbeing turned idly by its bed rack 242 so as to keep the same in propertime relation until the right hand Now. as

connecting piece again engages the same.

Thus a smooth acting mechanism isjrof vided by which a very heavy bedcan be r'e out jar.

By using revers ng gears and reversing racks the strain and wear ofthereversing movements is taken entirely oft of the driving pinion 19 andrack 20 which is employed for the constant speed movements, and hencewear on these parts is saved so that they will work accurately whenca"lled,mto action, which 18 necessary, as. the constant.

- very strong arrangement. is"pro\ ided to take andstrains and as thetwo mechan re arranged at equal distances from .the center, the bed' iskept froint'wisting.

pinion 24: can be kept eon-' The right-hand "stantly in mesh with therack 24:

driving mechanism' therefor for imparting a Ihe' details herein-shownand described maybe greatly varie'd'by a skilled mechanic withoutdeparting from the scope of my invention. .c v p v a Having fullydescribed my invention, what I claim and desire to secure by Letters-Patent ofthe United States is,

1. A mechanical movement comprising'a main driving mechanism and a crankactu ated reversing mechanism connected tolopcrate for more than a halfturn for a reverse. A mechanical movement comprising a main drivingmechanism, a crank actuated rev 'ing mechanism connected to reverse theed at the extremes of its travel'in either .direction and to actfor morethan a half turn for each reversing movement.

3.111 a mechanical movement the combir llltlOlbOf a reciprocatingmember, a mam constant speed movement thereto, and a reversing mechanismfor-slowing down, stopping and starting the member in the oppo- -..si tedirection, the time of the uniform speed -movements being less than thetime of the reversing movements,

4. A two revolution mechanical movement for converting rotary 1nto recprocating movement, comprising a mam driving mechanism for impartinguniform forward and backward movements, to a reciprocating member,a'crank reversing mechanism, and means for connecting the crankreversing mechansim to a reciproc ting'n'iember for more than a halfrevolutidli of the crank between each of the uniform movements.

A, mechanical movement comprising a main drivingmechani'sm, a revolvingcrank, a pitnianconnected thereto and connections therefrom to the bed.arranged so that the sweetside. of the pitman will be employed. for thereversing movement for more than a half turn of the revolving crank.

' (3. A mechanism comprising a main driv ing mechanism, a revolvingcrank, a pitman connected thereto and'connections therefrom to the bedarranged so that the sweetv side of the pitman will be employed foreach. reversijngv movement and so that the samewill be connected to thebed for more than a half turn for each reversing movement.

'4'. Ina mechanical movement the combina tion of the' moving member,arack carried by the same, a driving pinion engaging sald rack, aninternal gear having less-than half a circui'nference and a pinionfor'turning the],

square the bed. 2

9. A reversing mechanism comprising a crank actuated sliding member andtwo sets ofconnections therefrom to the bed acting at each reverse tosquare the bed. v

' 1Q. A'reversing mechanism for amechanical' movement, comprisingaflrevolvingwristpin; a sliding member, a pitnian'connection between thesliding member and a wrist-pin,

[two connecting pieces attached to-the sliding member, and connectionswhereby both connecting pieces. willbe geared to the-bed for eachreverse. y a W 11. IA mechanical movement comprising a main shaft, .apartial internal and a partial external gear carried'thereby, a drivingpinion and rack, pinions with which said partial gears engage to make upa main driving mechanism, :a wrist-pin carried by the internal gear, apitman connection between-the wrist-pin and sliding member, connectingpiecescarried by the sliding memben and means whereby they are geared tothe bed for each reversing action. t

12. A mechanical movement comprising a main shaft, a partial internaland a partialexternal gear, carried thereby, a vdriving pinion and rack,pinions connected to thedriv ing pinion and arrangedto cooperate withthe partiaLge-ars "to form a main driving mechanism, a wrist-pin carriedby the internal gear, a sliding member, a .pitman connection between thesliding "member" and the sliding member, a reversing gear and rack foreach connecting p ece, and means for oppositely gearing the connectingpieces to the reversing pinions for alternatereverses. I 4 H I V,

In testimony whereofl have herennto'set my hand, in the presence of twosnbscriblng witnesses.

' '--O .'J. ROBERTSON. 'IVitnesses: 1 I

ROBERT .T. JOHNSTO FRED J. Vmwno.

mechanism .con-

